Sections of the Big Four Ice Caves have collapsed, leading Snohomish County officials to warn visitors about the dangers of falling ice and rocks in the area.

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Snohomish County officials are warning visitors to the popular Big Four Ice Caves to use extreme caution in the area, as sections of the cave have collapsed because of warm weather.

Mount Baker-Snoqualmie National Forest visitors should stay on the trail, and not enter or stand on top of caves, according to the Snohomish County Sheriff’s Office. Visitors should also be cautious outside the caves below Big Four Mountain, which is prone to falling rocks and ice.

“As we head into the busiest and warmest part of the season, the cave is in its most dangerous state,” Lead Field Ranger Matthew Riggen said in a news release. “The cave is in a condition that we would normally not see until at least September – large, inviting and collapsing.”

Grace Tam, an 11-year-old from Lake Stevens, was killed in 2010 when she was struck by a boulder of ice at the caves. A sign at the trail viewpoint was installed in memory of Grace and warns visitors of the potential danger of the site.